參數(shù)資料
型號: μPD780021Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 26/66頁
文件大小: 453K
代理商: ΜPD780021Y
μ
PD780021Y, 780022Y, 780023Y, 780024Y
Preliminary Data Sheet
26
(2) Serial interface SIO30
The serial interface SIO30 has the 3-wire serial I/O mode.
3-wire serial I/O mode (fixed as MSB first)
This is an 8-bit data transfer mode using three lines: serial clock line (SCK30), serial output line (SO30),
and serial input line (SI30).
Since simultaneous transmit and receive operations are available in the 3-wire serial I/O mode, the
processing time for data transfer is reduced.
The first bit in 8-bit data in the serial transfer is fixed as MSB.
The 3-wire serial I/O mode is useful for connection to a peripheral I/O device that includes a clocked serial
interface, a display controller, etc.
Figure 5-10. Block Diagram of Serial Interface SIO30
Internal bus
8
8
Direction control circuit
Serial clock
control circuit
Serial clock
counter
Interrupt request
signal generation
circuit
Selector
Serial I/O shift register
30 (SIO30)
SI30/P20
SO30/P21
SCK30/P22
INTCSI30
f
X
/2
3
f
X
/2
4
f
X
/2
5
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